#include<stdio.h>
#include<unistd.h>

int main()
{
    printf("父进程被创建,准备创建子进程。。。\n");
    sleep(3);
    pid_t id = fork();
    if(id<0)
    {
        perror("fork\n");
        return -1;
    }
    else if(id == 0)
    {
        while(1)
        {
            printf("I am a child process, pid:%d, ppid:%d\n",getpid(),getppid());
            sleep(1);
        }
    }
    else 
    {
        while(1)
        {
            printf("I am a father process, pid:%d, ppid:%d\n",getpid(),getppid());
            sleep(1);
        }
    }

    return 0;
}